1; RUN: opt -O2 %s | llvm-dis > %t1 2; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s 3; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s 4; Source code: 5; typedef struct s1 { int a1; int a2:4; int a3;} __s1; 6; enum { FIELD_BYTE_SIZE = 1, }; 7; int test(__s1 *arg) { 8; return __builtin_preserve_field_info(arg->a2, FIELD_BYTE_SIZE); 9; } 10; Compilation flag: 11; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c 12 13target triple = "bpf" 14 15%struct.s1 = type { i32, i8, i32 } 16 17; Function Attrs: nounwind readnone 18define dso_local i32 @test(ptr readnone %arg) local_unnamed_addr #0 !dbg !11 { 19entry: 20 call void @llvm.dbg.value(metadata ptr %arg, metadata !23, metadata !DIExpression()), !dbg !24 21 %0 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.s1s(ptr elementtype(%struct.s1) %arg, i32 1, i32 1), !dbg !25, !llvm.preserve.access.index !17 22 %1 = tail call i32 @llvm.bpf.preserve.field.info.p0(ptr %0, i64 1), !dbg !26 23 ret i32 %1, !dbg !27 24} 25 26; CHECK: r0 = 4 27; CHECK: exit 28 29; CHECK: .long 6 # BTF_KIND_STRUCT(id = 3) 30 31; CHECK: .ascii "s1" # string offset=6 32; CHECK: .ascii ".text" # string offset=31 33; CHECK: .ascii "0:1" # string offset=37 34 35; CHECK: .long 16 # FieldReloc 36; CHECK-NEXT: .long 31 # Field reloc section string offset=31 37; CHECK-NEXT: .long 1 38; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 39; CHECK-NEXT: .long 3 40; CHECK-NEXT: .long 37 41; CHECK-NEXT: .long 1 42 43; Function Attrs: nounwind readnone 44declare ptr @llvm.preserve.struct.access.index.p0.p0.s1s(ptr, i32, i32) #1 45 46; Function Attrs: nounwind readnone 47declare i32 @llvm.bpf.preserve.field.info.p0(ptr, i64) #1 48 49; Function Attrs: nounwind readnone speculatable 50declare void @llvm.dbg.value(metadata, metadata, metadata) #2 51 52attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 53attributes #1 = { nounwind readnone } 54attributes #2 = { nounwind readnone speculatable } 55 56!llvm.dbg.cu = !{!0} 57!llvm.module.flags = !{!7, !8, !9} 58!llvm.ident = !{!10} 59 60!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 6c63b5d6a1cb84a75807804337c855a41c976260)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None) 61!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core") 62!2 = !{!3} 63!3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 2, baseType: !4, size: 32, elements: !5) 64!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned) 65!5 = !{!6} 66!6 = !DIEnumerator(name: "FIELD_BYTE_SIZE", value: 1, isUnsigned: true) 67!7 = !{i32 2, !"Dwarf Version", i32 4} 68!8 = !{i32 2, !"Debug Info Version", i32 3} 69!9 = !{i32 1, !"wchar_size", i32 4} 70!10 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 6c63b5d6a1cb84a75807804337c855a41c976260)"} 71!11 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 3, type: !12, scopeLine: 3, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !22) 72!12 = !DISubroutineType(types: !13) 73!13 = !{!14, !15} 74!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 75!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64) 76!16 = !DIDerivedType(tag: DW_TAG_typedef, name: "__s1", file: !1, line: 1, baseType: !17) 77!17 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s1", file: !1, line: 1, size: 96, elements: !18) 78!18 = !{!19, !20, !21} 79!19 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !17, file: !1, line: 1, baseType: !14, size: 32) 80!20 = !DIDerivedType(tag: DW_TAG_member, name: "a2", scope: !17, file: !1, line: 1, baseType: !14, size: 4, offset: 32, flags: DIFlagBitField, extraData: i64 32) 81!21 = !DIDerivedType(tag: DW_TAG_member, name: "a3", scope: !17, file: !1, line: 1, baseType: !14, size: 32, offset: 64) 82!22 = !{!23} 83!23 = !DILocalVariable(name: "arg", arg: 1, scope: !11, file: !1, line: 3, type: !15) 84!24 = !DILocation(line: 0, scope: !11) 85!25 = !DILocation(line: 4, column: 45, scope: !11) 86!26 = !DILocation(line: 4, column: 10, scope: !11) 87!27 = !DILocation(line: 4, column: 3, scope: !11) 88